Hook attachment for ladders



Sept. 7, 1948. G. K. HURD 2,448,716

'HOOK ATTACHMENT FOR LADDERS Filed Dec. 9, 1944 Irfl/en for. George K.Hurd.

Patented ept "7, 194$ UNITED STATES PATENTI OFFICE T v T 2,448,716

noox ATTACHMENT on LADDERS George K. Hurd, Torontopont ari m. Canada. lApplication December 9, 1944, s rial No. 567,377 g 1 c v i The principalobject of this-invention is to provide a device for attachment toladders which will enable them to be securely anchored at the top on aroof, parapet, window sill or other portion of a building where firemenor workmen are required to operate, and to provide a strong device whichmay be very easily and quickly attached to or detached from any ladderso that it will be rendered safe.

The principal feature of the invention consists in the novelconstruction of a rigid frame adapted to fit between the side bars of aladder to which are integrally secured a pair of rigid bar hooks whichembrace a ladder rung and extend upwardly and outwardly therefrom tooverreach the ridge of a roof or other projection to securely engage thesame, the central member supporting the hooks having adjustable meansfor securely engaging the ladder rung adjacent to the rung engaging thehook member.

In the accompanying drawings, Figure 1 is a side elevational view of aladder provided with my improved hook attachment shown in operatingposition with the hooks extending over the ridge of a building.

Figure 2 is an enlarged front elevational view of my improvedattachment.

Figure 3 is a side elevational view of the attachment shown in Figure 2.Figure 4 shows a modification.

Roof ladders as used by firemen in the prosecution of their duties areordinarily provided with hook extensions rigidly secured to the siderails of the ladder, so that the ladder may be hooked over the eave or aledge or any projection on a building to hold securely by the en- 3claims. (01. 222 51) agement of the point of the hook with the enformedof round steel bar stock of suitable dimensions to securely support thelong ladder and curved with a suflicient radius to reach well over aneave or roof ridge or a parapet, the end B of said hooks being pointedto enable them to effect a secure grip on any surface.

The other end of these hook members are curved inwardly and upwardlywith a short curved hook C which is sufficiently large to embrace therung D of a ladder.

The hooks A are spaced apart a distance sufilcient to permit them beingplaced between the side rails E of a'ladder and they are rigidly securedin panallelsrelation to each other by welding or brazing to theshortspaced side portions F of a triangular loop G. also formed of roundsteel bar. stock; The books C project toward the largehooks A and awayfrom the frame G.

i The frame G is made ofya single length of steel rod: witha crossportion extending between the straight parallel portion-s F and from thestraight portions of the bars angle inwardly to meet each othercentrally of their width, one end H thereof meeting an obtuse angledbend I in the other portion and being securely brazed or welded thereto.The central extension J of this triangular frame is threaded with aheavy standard thread upon which is threaded a wing nut K.

Slidably mounted on this threaded portion J of the frame is a sleeve Lwhich is formed with a lateral hook extension M which is adapted toextend over the ladder rung N next below the rung D. This hooked memberis clamped tightly against the rung N by means of the wing nut K andpushing upwardly against the Y frame it holds the hooks C firmly inposition against the under side of the upper rung D.

It will be readily appreciated that this device may be very quicklyattached to or detached from a ladder. It is merely necessary to loosenthe wing nut K and adjust the sleeve on the threaded stem J of the frameso that the hook M will clear the rung N permitting the device to besimply lifted off the ladder; the device may be simply replaced on anyladder by placing the hooks C to engage the desired rung, then bysliding the sleeve L on the threaded stem of the frame until it engagesthe next succeeding rung of the ladder and then turning the wing nutdown to engage this sleeve and tightening it in place; the device isfirmly secured in position, so that it becomes a rigid part of theladder and will withstand any kind of rough usage and cannot becomeaccidentally misplaced or forcibly torn off.

A device such as described is of very simple but efiective constructionand its use will enable ladders to be usd in almost any conceivableposition with remark-able safety.

It will be appreciated that a device as described may be instantlyfitted on any ladder irrespective of the spacing of the rungs.

In the modified structure illustrated in Figure 4 the threading of theframe extension J may be dispensed with and said extension provided witha flange :i at the top and a coil compression The device-can be, readilyremove'dbypushingi. down on-the hooks Ate-disengage hooks-01mm the rungD.

What I claim as my invention is: a

1. A hook attachment for ladders con pgising a pair of curved roofengaging hook's formed of bar stock extending downwardlyto overli'etheupper rung on the outward side andcumed 1112 wardly and upwardly toembrace 'the'adiacent rung, a bar steel frame formed of a rig-idtrlangular loop having agicentral stem extending rigidly from one.corner; and having thehother core. ners bent into 'gstlfillghtifilparallel. 5 relation and welded to said ;hooks .and .-:supp0rting= them.-;in parallel relation, and .a. rung zhookzaadiustably mounted on thecentralvstem of said frame...

2. A hookeattachment; forcladders, comprising a pair oficur-ved-roofengaging hooks having short upturned rung .gengaging shocks, a irigid.eframe:

4 formed of a single length of bar stock bent into a closed Y-shapedframe having the outer sides rigidly secured to the aforesaid hooks andhaving the lower central stem portion threaded, a nut threaded on saidstem, and a hook formed with a sleeve slidably mounted on said threadedstem.

3. A device as claimed in claim 2 having a coiled compression springengaging the adjustable hook to hold it downwardly in a locked position.

. GEORGEKAHURD.

REFERENCES CITED The following references are of record in the filie;sent-his .1 spat ent LINI'IZEDSTATES PATENTS Number Name Date 31,953Farrar Apr. 9, 1861 215,729 Foster May 27, 1879 556,464 Hafiermehl Mar.17, 1896 679359 11 Dinsmore Mil/1223,1897 1,018,'877 Chickering iFbr27fl' 1912' 1,030,905 Lucas July- 2, 1912 FOREIGN. PATENTS Number; 1'Country ,v Date Great Britain 7.--- .iIuly i30,;'1898,-

